CDL AIR BRAKES PRACTICE TEST - MICHIGAN
16.
By pushing the trailer air supply control knob in, you:
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shut the air off and put on the trailer emergency brakes.
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supply the trailer with air.
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supply the tires with air.
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17.
The air tanks should be drained completely to remove:
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water and oil.
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carbon monoxide.
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air.
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18.
Spring brakes are usually held back by:
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modulating control valves.
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the antilock braking system.
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air pressure.
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19.
While driving, you should use your mirrors to:
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check where the rear of your vehicle is while you make turns.
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know where other vehicles are around you.
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All of the above.
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20.
Some air brake systems have an alcohol evaporator. Checking the alcohol container and filling it up as necessary:
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helps you avoid wheel lock up.
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helps keep the engine cool, as well as lubricating it.
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reduces the risk of ice in air brake valves during cold weather.
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